Additive Machined Piston Combustion Surface for Thermal Management
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Solution Overview
Problem
Pistons for internal combustion engines face challenges in withstanding high temperatures and harsh conditions due to oxidation, erosion, and coking, with high thermal conductivity and oxidation-resistant materials being expensive and impractical for widespread use.
Innovation Solution
A piston manufacturing method that forms a crown and skirt portion from an economical material and uses additive machining to create a high-performance metal combustion surface, such as stainless steel or nickel-based alloys, reducing waste and production costs while enhancing thermal conductivity and resistance to extreme conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-performance materials with high thermal conductivity and oxidation resistance are used for the entire piston, then the piston can withstand high temperatures and harsh conditions, but the production cost increases significantly
Solution Approach 1:
The patent applies local quality by using high-performance materials only in specific areas where they are most needed. The combustion surface and cooling gallery regions receive deposits of materials with high thermal conductivity and oxidation resistance, while other areas of the piston use conventional materials. This localized application resolves the contradiction by providing enhanced performance only where required, rather than using expensive materials throughout the entire piston structure.
Solution Approach 2:
The patent employs composite materials by combining conventional piston materials with high-performance material deposits. The base piston material provides structural integrity, while additive deposits of stainless steel, nickel-based alloys, or ceramic materials provide enhanced thermal and chemical resistance in critical areas. This composite approach allows the piston to withstand harsh combustion conditions while maintaining cost-effectiveness.
2Ease of manufacture
If additive machining process is used to form combustion surface from high-performance metal, then waste material is reduced and production costs decrease, but the manufacturing process complexity increases
Solution Approach 1:
The patent replaces traditional mechanical machining processes with additive machining technology. Instead of removing material through conventional machining methods, the invention uses additive processes to deposit high-performance materials directly onto the combustion surface. This substitution reduces waste material and production costs while the added complexity is offset by the benefits of material efficiency and targeted performance enhancement.
3Reliability
If expensive high-performance materials are used throughout the entire piston, then oxidation resistance and erosion resistance are improved, but the production time and costs increase
Solution Approach 1:
The patent applies local quality by concentrating high-performance materials only in areas most susceptible to oxidation and erosion, such as the combustion surface and cooling gallery regions. This localized protection provides adequate resistance to harsh conditions while avoiding the use of expensive materials in areas where they are not needed, thereby maintaining production efficiency and cost-effectiveness.
Solution Approach 2:
The patent applies partial action by providing enhanced material protection only to the extent necessary for withstanding combustion chamber conditions. Rather than uniformly applying expensive high-performance materials throughout the entire piston, the additive process deposits materials selectively in critical zones, achieving sufficient oxidation and erosion resistance without excessive material usage or production cost.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method results in a cost-effective piston capable of withstanding combustion chamber conditions, utilizing expensive high-performance materials only where needed, thereby reducing overall production costs and maintaining performance.
Implementation Method 1
The additive machining process includes melting the first material and the second material together, and depositing a plurality of layers of the melted second material on the melted first material
Data Source
AI summary
A piston capable of withstanding high temperatures and extreme conditions of a combustion chamber of an internal combustion engine and manufactured with reduced costs is provided. The method of manufacturing the piston includes casting or forging the bulk of the piston as a single-piece with an open cooling gallery from an economical first material, such as steel, cast iron, or aluminum. The method further includes forming a portion of a combustion bowl surface, which is a small area of the piston directly exposed to the combustion chamber, from a second material by additive machining. The second material has a higher thermal conductivity and higher resistance to oxidation, erosion, and oil coking, compared to the first material. The additive machining process is efficient and creates little waste, which further reduces production costs.